Unironically, if we found aliens and it turns out ALL of the sentient ones are just multicolored humans with neat details and culture but otherwise identical to us, how the fuck would anyone explain that?

I mean yeah you could explain some convergent evolution for them to have something similar to hands for tool use and other stuff, but if somehow we found out literal humans live everywhere in space how could you possibly explain that without some hyperborean schizo civilization theory or God himself just running out of ideas and copy-pasting humans across the galaxy?